I'm considering purchasing a new case fan for the rear of my pc but, as usual, I have a few queries.

Firstly is a case fan for the rear of a pc supposed to exhaust are or suck it in. Ideally I want it to exhaust hot air and dust.

Secondly I have a case similar to this one - http://www.xbitlabs.com/articles/oth...chenbro_4.html. It has a funny green thing on the back that is supposedly a 120mm fan mount but i've looked at it carefully and I don't see how it could work. This is the fan i'm considering - http://www.lowestonweb.com/products/...F-72EE9A2B3FEA - if anyone knows whether it would fit that would be a great help.

Cheers in advance